var pattern = {
    email: /^\S+?@\S+?\.\S+?$/,
    idcard: /^[1-9]\d{5}(18|19|([23]\d))\d{2}((0[1-9])|(10|11|12))(([0-2][1-9])|10|20|30|31)\d{3}[0-9Xx]$/,
    url: new RegExp(
        "^(?!mailto:)(?:(?:http|https|ftp)://|//)(?:\\S+(?::\\S*)?@)?(?:(?:(?:[1-9]\\d?|1\\d\\d|2[01]\\d|22[0-3])(?:\\.(?:1?\\d{1,2}|2[0-4]\\d|25[0-5])){2}(?:\\.(?:[0-9]\\d?|1\\d\\d|2[0-4]\\d|25[0-4]))|(?:(?:[a-z\\u00a1-\\uffff0-9]+-*)*[a-z\\u00a1-\\uffff0-9]+)(?:\\.(?:[a-z\\u00a1-\\uffff0-9]+-*)*[a-z\\u00a1-\\uffff0-9]+)*(?:\\.(?:[a-z\\u00a1-\\uffff]{2,})))|localhost)(?::\\d{2,5})?(?:(/|\\?|#)[^\\s]*)?$",
        'i')
};

const FORMAT_MAPPING = {
    "int": 'integer',
    "bool": 'boolean',
    "double": 'number',
    "long": 'number',
    "password": 'string'
    // "fileurls": 'array'
}

function formatMessage(args, resources = '') {
    var defaultMessage = ['label']
    defaultMessage.forEach((item) => {
        if (args[item] === undefined) {
            args[item] = ''
        }
    })

    let str = resources
    for (let key in args) {
        let reg = new RegExp('{' + key + '}')
        str = str.replace(reg, args[key])
    }
    return str
}

function isEmptyValue(value, type) {
    if (value === undefined || value === null) {
        return true;
    }

    if (typeof value === 'string' && !value) {
        return true;
    }

    if (Array.isArray(value) && !value.length) {
        return true;
    }

    if (type === 'object' && !Object.keys(value).length) {
        return true;
    }

    return false;
}

const types = {
    integer(value) {
        return types.number(value) && parseInt(value, 10) === value;
    },
    string(value) {
        return typeof value === 'string';
    },
    number(value) {
        if (isNaN(value)) {
            return false;
        }
        return typeof value === 'number';
    },
    "boolean": function (value) {
        return typeof value === 'boolean';
    },
    "float": function (value) {
        return types.number(value) && !types.integer(value);
    },
    array(value) {
        return Array.isArray(value);
    },
    object(value) {
        return typeof value === 'object' && !types.array(value);
    },
    date(value) {
        return value instanceof Date;
    },
    timestamp(value) {
        if (!this.integer(value) || Math.abs(value).toString().length > 16) {
            return false
        }
        return true;
    },
    file(value) {
        return typeof value.url === 'string';
    },
    email(value) {
        return typeof value === 'string' && !!value.match(pattern.email) && value.length < 255;
    },
    url(value) {
        return typeof value === 'string' && !!value.match(pattern.url);
    },
    pattern(reg, value) {
        try {
            return new RegExp(reg).test(value);
        } catch (e) {
            return false;
        }
    },
    method(value) {
        return typeof value === 'function';
    },
    idcard(value) {
        return typeof value === 'string' && !!value.match(pattern.idcard);
    },
    'url-https'(value) {
        return this.url(value) && value.startsWith('https://');
    },
    'url-scheme'(value) {
        return value.startsWith('://');
    },
    'url-web'(value) {
        return false;
    }
}

class RuleValidator {

    constructor(message) {
        this._message = message
    }

    async validateRule(fieldKey, fieldValue, value, data, allData) {
        var result = null

        let rules = fieldValue.rules

        let hasRequired = rules.findIndex((item) => {
            return item.required
        })
        if (hasRequired < 0) {
            if (value === null || value === undefined) {
                return result
            }
            if (typeof value === 'string' && !value.length) {
                return result
            }
        }

        var message = this._message

        if (rules === undefined) {
            return message['default']
        }

        for (var i = 0; i < rules.length; i++) {
            let rule = rules[i]
            let vt = this._getValidateType(rule)

            Object.assign(rule, {
                label: fieldValue.label || `["${fieldKey}"]`
            })

            if (RuleValidatorHelper[vt]) {
                result = RuleValidatorHelper[vt](rule, value, message)
                if (result != null) {
                    break
                }
            }

            if (rule.validateExpr) {
                let now = Date.now()
                let resultExpr = rule.validateExpr(value, allData, now)
                if (resultExpr === false) {
                    result = this._getMessage(rule, rule.errorMessage || this._message['default'])
                    break
                }
            }

            if (rule.validateFunction) {
                result = await this.validateFunction(rule, value, data, allData, vt)
                if (result !== null) {
                    break
                }
            }
        }

        if (result !== null) {
            result = message.TAG + result
        }

        return result
    }

    async validateFunction(rule, value, data, allData, vt) {
        let result = null
        try {
            let callbackMessage = null
            const res = await rule.validateFunction(rule, value, allData || data, (message) => {
                callbackMessage = message
            })
            if (callbackMessage || (typeof res === 'string' && res) || res === false) {
                result = this._getMessage(rule, callbackMessage || res, vt)
            }
        } catch (e) {
            result = this._getMessage(rule, e.message, vt)
        }
        return result
    }

    _getMessage(rule, message, vt) {
        return formatMessage(rule, message || rule.errorMessage || this._message[vt] || message['default'])
    }

    _getValidateType(rule) {
        var result = ''
        if (rule.required) {
            result = 'required'
        } else if (rule.format) {
            result = 'format'
        } else if (rule.arrayType) {
            result = 'arrayTypeFormat'
        } else if (rule.range) {
            result = 'range'
        } else if (rule.maximum !== undefined || rule.minimum !== undefined) {
            result = 'rangeNumber'
        } else if (rule.maxLength !== undefined || rule.minLength !== undefined) {
            result = 'rangeLength'
        } else if (rule.pattern) {
            result = 'pattern'
        } else if (rule.validateFunction) {
            result = 'validateFunction'
        }
        return result
    }
}

const RuleValidatorHelper = {
    required(rule, value, message) {
        if (rule.required && isEmptyValue(value, rule.format || typeof value)) {
            return formatMessage(rule, rule.errorMessage || message.required);
        }

        return null
    },

    range(rule, value, message) {
        const {
            range,
            errorMessage
        } = rule;

        let list = new Array(range.length);
        for (let i = 0; i < range.length; i++) {
            const item = range[i];
            if (types.object(item) && item.value !== undefined) {
                list[i] = item.value;
            } else {
                list[i] = item;
            }
        }

        let result = false
        if (Array.isArray(value)) {
            result = (new Set(value.concat(list)).size === list.length);
        } else {
            if (list.indexOf(value) > -1) {
                result = true;
            }
        }

        if (!result) {
            return formatMessage(rule, errorMessage || message['enum']);
        }

        return null
    },

    rangeNumber(rule, value, message) {
        if (!types.number(value)) {
            return formatMessage(rule, rule.errorMessage || message.pattern.mismatch);
        }

        let {
            minimum,
            maximum,
            exclusiveMinimum,
            exclusiveMaximum
        } = rule;
        let min = exclusiveMinimum ? value <= minimum : value < minimum;
        let max = exclusiveMaximum ? value >= maximum : value > maximum;

        if (minimum !== undefined && min) {
            return formatMessage(rule, rule.errorMessage || message['number'][exclusiveMinimum ?
                'exclusiveMinimum' : 'minimum'
                ])
        } else if (maximum !== undefined && max) {
            return formatMessage(rule, rule.errorMessage || message['number'][exclusiveMaximum ?
                'exclusiveMaximum' : 'maximum'
                ])
        } else if (minimum !== undefined && maximum !== undefined && (min || max)) {
            return formatMessage(rule, rule.errorMessage || message['number'].range)
        }

        return null
    },

    rangeLength(rule, value, message) {
        if (!types.string(value) && !types.array(value)) {
            return formatMessage(rule, rule.errorMessage || message.pattern.mismatch);
        }

        let min = rule.minLength;
        let max = rule.maxLength;
        let val = value.length;

        if (min !== undefined && val < min) {
            return formatMessage(rule, rule.errorMessage || message['length'].minLength)
        } else if (max !== undefined && val > max) {
            return formatMessage(rule, rule.errorMessage || message['length'].maxLength)
        } else if (min !== undefined && max !== undefined && (val < min || val > max)) {
            return formatMessage(rule, rule.errorMessage || message['length'].range)
        }

        return null
    },

    pattern(rule, value, message) {
        if (!types['pattern'](rule.pattern, value)) {
            return formatMessage(rule, rule.errorMessage || message.pattern.mismatch);
        }

        return null
    },

    format(rule, value, message) {
        var customTypes = Object.keys(types);
        var format = FORMAT_MAPPING[rule.format] ? FORMAT_MAPPING[rule.format] : (rule.format || rule.arrayType);

        if (customTypes.indexOf(format) > -1) {
            if (!types[format](value)) {
                return formatMessage(rule, rule.errorMessage || message.typeError);
            }
        }

        return null
    },

    arrayTypeFormat(rule, value, message) {
        if (!Array.isArray(value)) {
            return formatMessage(rule, rule.errorMessage || message.typeError);
        }

        for (let i = 0; i < value.length; i++) {
            const element = value[i];
            let formatResult = this.format(rule, element, message)
            if (formatResult !== null) {
                return formatResult
            }
        }

        return null
    }
}

class SchemaValidator extends RuleValidator {

    constructor(schema, options) {
        super(SchemaValidator.message);

        this._schema = schema
        this._options = options || null
    }

    updateSchema(schema) {
        this._schema = schema
    }

    async validate(data, allData) {
        let result = this._checkFieldInSchema(data)
        if (!result) {
            result = await this.invokeValidate(data, false, allData)
        }
        return result.length ? result[0] : null
    }

    async validateAll(data, allData) {
        let result = this._checkFieldInSchema(data)
        if (!result) {
            result = await this.invokeValidate(data, true, allData)
        }
        return result
    }

    async validateUpdate(data, allData) {
        let result = this._checkFieldInSchema(data)
        if (!result) {
            result = await this.invokeValidateUpdate(data, false, allData)
        }
        return result.length ? result[0] : null
    }

    async invokeValidate(data, all, allData) {
        let result = []
        let schema = this._schema
        for (let key in schema) {
            let value = schema[key]
            let errorMessage = await this.validateRule(key, value, data[key], data, allData)
            if (errorMessage != null) {
                result.push({
                    key,
                    errorMessage
                })
                if (!all) break
            }
        }
        return result
    }

    async invokeValidateUpdate(data, all, allData) {
        let result = []
        for (let key in data) {
            let errorMessage = await this.validateRule(key, this._schema[key], data[key], data, allData)
            if (errorMessage != null) {
                result.push({
                    key,
                    errorMessage
                })
                if (!all) break
            }
        }
        return result
    }

    _checkFieldInSchema(data) {
        var keys = Object.keys(data)
        var keys2 = Object.keys(this._schema)
        if (new Set(keys.concat(keys2)).size === keys2.length) {
            return ''
        }

        var noExistFields = keys.filter((key) => {
            return keys2.indexOf(key) < 0;
        })
        var errorMessage = formatMessage({
            field: JSON.stringify(noExistFields)
        }, SchemaValidator.message.TAG + SchemaValidator.message['defaultInvalid'])
        return [{
            key: 'invalid',
            errorMessage
        }]
    }
}

function Message() {
    return {
        TAG: "",
        default: '验证错误',
        defaultInvalid: '提交的字段{field}在数据库中并不存在',
        validateFunction: '验证无效',
        required: '{label}必填',
        'enum': '{label}超出范围',
        timestamp: '{label}格式无效',
        whitespace: '{label}不能为空',
        typeError: '{label}类型无效',
        date: {
            format: '{label}日期{value}格式无效',
            parse: '{label}日期无法解析,{value}无效',
            invalid: '{label}日期{value}无效'
        },
        length: {
            minLength: '{label}长度不能少于{minLength}',
            maxLength: '{label}长度不能超过{maxLength}',
            range: '{label}必须介于{minLength}和{maxLength}之间'
        },
        number: {
            minimum: '{label}不能小于{minimum}',
            maximum: '{label}不能大于{maximum}',
            exclusiveMinimum: '{label}不能小于等于{minimum}',
            exclusiveMaximum: '{label}不能大于等于{maximum}',
            range: '{label}必须介于{minimum}and{maximum}之间'
        },
        pattern: {
            mismatch: '{label}格式不匹配'
        }
    };
}


SchemaValidator.message = new Message();

export default SchemaValidator
